Problem
You would like to find out the serial number of your Lenovo laptop, but without switching it off and taking the battery off.
Solution
You can run the following to get your laptop’s details including the serial number:
sudo dmidecode -t system
Taken from the post here
Problem
You are trying to install the gems for your rails application in a new computer, or by using ruby 2.4 and you get the following error:
An error occurred while installing json (1.8.3), and Bundler cannot continue. Make sure that `gem install json -v '1.8.3'` succeeds before bundling.
Solution
Remove your old Gemfile.lock file and run bundle again. A newer version of json (ie 1.8.6) should be installed.
Problem
When you are trying to install a package inside a debian Docker container you get the following error message:
FATAL -> Failed to fork.
Solution
This is an indication of ‘out of memory’ so add a swap partition if it does not exist, on the host with the following:
fallocate -l 4G /swapfile chmod 600 /swapfile mkswap /swapfile swapon /swapfile echo "/swapfile swap swap sw 0 0" >> /etc/fstab
(Thanks Valent)